class-transformer

Decorator-based transformation, serialization, and deserialization between objects and classes.

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7.3KGitHub stars

REPOSITORY AT A GLANCE

What to know before exploring

What it is

Decorator-based transformation, serialization, and deserialization between objects and classes.

GitHub

Where it is used

No documented product use has been verified yet.

What people are saying

No recommendation phrase was found in the indexed comments.

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Also in these discussions

typestack/class-validator · linked in 2 of the same discussions

Mentioned in the same Hacker News threads. That is not proof they are substitutes.

This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 3:03:16 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year4 dated mentions

Observed mentions: 2018-02-27 16:51:09 UTC to 2023-06-23 00:31:35 UTC.

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges

UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
Period	Start (UTC)	End (exclusive, UTC)	Mentions	Comments
2018	2018-01-01 00:00:00 UTC	2019-01-01 00:00:00 UTC	1	1
2019	2019-01-01 00:00:00 UTC	2020-01-01 00:00:00 UTC	1	1
2020	2020-01-01 00:00:00 UTC	2021-01-01 00:00:00 UTC	1	1
2021	2021-01-01 00:00:00 UTC	2022-01-01 00:00:00 UTC	0	0
2022	2022-01-01 00:00:00 UTC	2023-01-01 00:00:00 UTC	0	0
2023	2023-01-01 00:00:00 UTC	2024-01-01 00:00:00 UTC	1	1

What Hacker News says

4 sources

MatthiasDev·Jun 23, 2023

Type reflection with TypeScript is fairly limited at the moment, though what you are describing can be done with decorators. I have made such a library myself: https://github.com/decoverto/decoverto Another library would be https://github.com/typestack/class-transformer

In Cookie Clicker saved my PhD

0XAFFE·Apr 9, 2020

I use a combination of class-transformer[1] and then class-validator[2]. First transform the JSON into proper class-objects and then validate the object for correctnes. IMHO this has nothing to do with TypeScript because in your runtime all the type information is gone and you need to validate the remote data never the less. TypeScript can help you structure your validations but you need to write them. [1] https://github.com/typestack/class-transformer [2] https://github.com/typestack/class-validator

In How porting to TypeScript solved our API woes

0XAFFE·Aug 22, 2019

There is also class-transformer[1] and class-validator[2] which also do the same job but integrate a bit better into the whole typescript cosmos. [1] https://github.com/typestack/class-transformer [2] https://github.com/typestack/class-validator

In Using TypeScript with React

electrotype·Feb 27, 2018

I agree. Using classes for entities allows you to use libraries such as https://github.com/typestack/class-transformer And allows you to use "instanceof". User defined type guards for interfaces are hackish at best.

In Typescript: class vs. interface